Technologies Guide

Detailed information about rules, patterns, and best practices for each supported technology.

Maturity Tiers

Claude Craft classifies its 11 application technology stacks into 3 maturity tiers. This reflects the depth of support: i18n coverage, agent specialization, commands, skills, and reference documentation.

Tier Overview

Tier	Label	Technologies	What to Expect
1	Core	Symfony, React, Python, Flutter	Production-grade support. Deep agent specialization, extensive i18n (25+ files), 8+ commands, 3+ tech-specific skills, full reference docs with examples.
2	Supported	React Native, PHP	Solid support. Customized reviewer agent, 7+ i18n files, 5+ commands, at least 1 tech-specific skill, full reference docs.
3	Community	C# / .NET, Angular, Laravel, Vue.js	Basic scaffolding. Generic reviewer template, 2+ i18n files, 3+ commands, shared skills only, basic CLAUDE.md reference. Community contributions welcome.
--	Infra	Docker, Coolify, Kubernetes, OpenTofu, Ansible, Hcloud, PgBouncer, FrankenPHP	Infrastructure tooling, not application stacks. Not tiered.

Tier Requirements

Requirement	Tier 3 (Community)	Tier 2 (Supported)	Tier 1 (Core)
i18n files	>= 2	>= 7	>= 25
Agent reviewer	Generic template	Customized	Deep specialization
Agent model	haiku	haiku	sonnet
Commands	>= 3	>= 5	>= 8
Skills	Shared only	1+ tech-specific	3+ tech-specific
Reference docs	Basic CLAUDE.md	Full reference	Full + examples

All Technologies at a Glance

Technology	Tier	Version	i18n Files	Commands	Status	To Reach Next Tier
Symfony / PHP	1 (Core)	8.1 / PHP 8.4+	58+	10+	Full support	--
React	1 (Core)	19.2 + Compiler 1.0	30+	10+	Full support	--
Python	1 (Core)	3.14+	25+	10+	Full support	--
Flutter / Dart	1 (Core)	3.44 / Dart 3.12	25+	10+	Full support	--
React Native	2 (Supported)	0.85 (New Architecture)	39	10	Good coverage	Expand i18n to 25+, deepen agent specialization, add 3+ tech-specific skills
PHP	2 (Supported)	8.5	7+	5	Solid base	Add more i18n files, expand commands to 8+, add tech-specific skills
C# / .NET	3 (Community)	10 LTS / C# 14	2	6	Basic scaffold	Add 5+ i18n files, customize reviewer agent, create tech-specific skill
Angular	3 (Community)	22	2	6	Basic scaffold	Add 5+ i18n files, customize reviewer agent, create tech-specific skill
Laravel	3 (Community)	13.x / PHP 8.3+	2	6	Basic scaffold	Add 5+ i18n files, customize reviewer agent, create tech-specific skill
Vue.js	3 (Community)	3.5+	2	6	Basic scaffold	Add 5+ i18n files, customize reviewer agent, create tech-specific skill
Paperclip	2 (Supported)	2026.609.0	29 × 5 langues (en/fr/es/de/pt)	8	Full i18n across 5 langs	Expand tests/skills, add audit commands, promote to Tier 1

Upgrade Path

To promote a stack from one tier to the next, see CONTRIBUTING.md for detailed requirements and contribution guidelines.

Overview

Technology	Rules	Focus Areas
Symfony	21	Clean Architecture, DDD, API Platform
Flutter	13	BLoC, State Management, Testing
Python	12	FastAPI, Async, Type Hints
React	12	Hooks, Performance, Accessibility
React Native	12	Navigation, Native Modules, Store
Paperclip	7	Two-Layer Architecture, Adapter Protocol, Governance (budgets/approvals), Audit Trails

Symfony

Architecture

The Symfony rules follow Clean Architecture with Domain-Driven Design (DDD):

src/
├── Domain/           # Business logic (entities, value objects)
│   ├── Model/
│   ├── Repository/   # Interfaces only
│   └── Event/
├── Application/      # Use cases (commands, queries, handlers)
│   ├── Command/
│   ├── Query/
│   └── Handler/
├── Infrastructure/   # External concerns (DB, API, files)
│   ├── Persistence/  # Repository implementations
│   ├── Api/
│   └── Service/
└── Presentation/     # Controllers, CLI, views
    ├── Controller/
    └── Command/

Key Rules

Rule	Description
`02-architecture-clean-ddd`	Clean Architecture layers
`13-ddd-patterns`	DDD tactical patterns
`14-multitenant`	Multi-tenancy support
`18-value-objects`	Value Object patterns
`19-aggregates`	Aggregate Root design
`20-domain-events`	Domain Event handling
`21-cqrs`	CQRS implementation

Commands

bash

# Generate CRUD with proper architecture
/symfony:generate-crud Product

# Check architecture compliance
/symfony:check-architecture

# Plan database migration
/symfony:migration-plan "Add user preferences"

Templates

aggregate-root.md - Aggregate root entity
value-object.md - Value object pattern
domain-event.md - Domain event
service.md - Application service

Flutter

Architecture

Flutter rules follow a feature-based architecture with BLoC pattern:

lib/
├── core/             # Shared utilities
│   ├── constants/
│   ├── errors/
│   ├── network/
│   └── utils/
├── features/         # Feature modules
│   └── auth/
│       ├── data/
│       │   ├── datasources/
│       │   ├── models/
│       │   └── repositories/
│       ├── domain/
│       │   ├── entities/
│       │   ├── repositories/
│       │   └── usecases/
│       └── presentation/
│           ├── bloc/
│           ├── pages/
│           └── widgets/
└── injection/        # Dependency injection

Key Rules

Rule	Description
`02-architecture`	Feature-based architecture
`07-testing`	Widget and unit testing
`12-performance`	Performance optimization
`13-state-management`	BLoC/Riverpod patterns

Commands

bash

# Generate feature module
/flutter:generate-feature authentication

# Generate widget with tests
/flutter:generate-widget UserAvatar

# Analyze performance
/flutter:analyze-performance

State Management

BLoC pattern with events and states:

dart

// Events
abstract class AuthEvent {}
class LoginRequested extends AuthEvent {
  final String email;
  final String password;
}

// States
abstract class AuthState {}
class AuthInitial extends AuthState {}
class AuthLoading extends AuthState {}
class AuthSuccess extends AuthState {
  final User user;
}
class AuthFailure extends AuthState {
  final String error;
}

// BLoC
class AuthBloc extends Bloc<AuthEvent, AuthState> {
  AuthBloc() : super(AuthInitial()) {
    on<LoginRequested>(_onLoginRequested);
  }
}

Python

Architecture

Python rules follow a layered architecture suitable for FastAPI/Django:

src/
├── api/              # API layer
│   ├── routes/
│   ├── schemas/      # Pydantic models
│   └── dependencies/
├── core/             # Configuration
│   ├── config.py
│   └── security.py
├── domain/           # Business logic
│   ├── models/
│   ├── services/
│   └── repositories/
├── infrastructure/   # External services
│   ├── database/
│   ├── cache/
│   └── external/
└── tests/

Key Rules

Rule	Description
`02-architecture`	Layered architecture
`07-testing`	Pytest best practices
`11-security`	Security guidelines
`12-performance`	Async optimization

Commands

bash

# Generate FastAPI endpoint
/python:generate-endpoint users

# Check async code
/python:async-check

# Type coverage analysis
/python:type-coverage

Type Hints

All code should use type hints:

python

from typing import Optional, List
from pydantic import BaseModel

class UserCreate(BaseModel):
    email: str
    password: str
    name: Optional[str] = None

async def create_user(
    user_data: UserCreate,
    db: AsyncSession
) -> User:
    user = User(**user_data.dict())
    db.add(user)
    await db.commit()
    return user

React

Architecture

React rules follow a feature-based structure with hooks:

src/
├── components/       # Shared components
│   ├── ui/          # Basic UI components
│   └── layout/      # Layout components
├── features/        # Feature modules
│   └── auth/
│       ├── components/
│       ├── hooks/
│       ├── api/
│       └── types/
├── hooks/           # Shared hooks
├── lib/             # Utilities
├── stores/          # State management
└── types/           # Global types

Key Rules

Rule	Description
`02-architecture`	Component architecture
`07-testing`	Testing Library patterns
`11-security`	XSS prevention
`12-performance`	Render optimization

Commands

bash

# Generate component with tests
/react:generate-component Button

# Generate custom hook
/react:generate-hook useAuth

# Check accessibility
/react:accessibility-check

Component Pattern

tsx

// Button.tsx
interface ButtonProps {
  variant?: 'primary' | 'secondary';
  size?: 'sm' | 'md' | 'lg';
  children: React.ReactNode;
  onClick?: () => void;
  disabled?: boolean;
}

export function Button({
  variant = 'primary',
  size = 'md',
  children,
  onClick,
  disabled = false,
}: ButtonProps) {
  return (
    <button
      className={cn(
        'rounded font-medium',
        variants[variant],
        sizes[size]
      )}
      onClick={onClick}
      disabled={disabled}
    >
      {children}
    </button>
  );
}

Hook Pattern

tsx

// useAuth.ts
export function useAuth() {
  const [user, setUser] = useState<User | null>(null);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    const unsubscribe = onAuthStateChanged((user) => {
      setUser(user);
      setLoading(false);
    });
    return unsubscribe;
  }, []);

  const login = useCallback(async (email: string, password: string) => {
    // Login logic
  }, []);

  const logout = useCallback(async () => {
    // Logout logic
  }, []);

  return { user, loading, login, logout };
}

React Native

Architecture

React Native rules extend React patterns for mobile:

src/
├── components/       # Shared components
├── features/        # Feature modules
├── navigation/      # Navigation setup
│   ├── RootNavigator.tsx
│   └── types.ts
├── screens/         # Screen components
├── services/        # Native services
├── stores/          # State management
└── utils/           # Platform utilities

Key Rules

Rule	Description
`02-architecture`	Mobile architecture
`07-testing`	Mobile testing
`11-security`	Mobile security
`12-performance`	Mobile performance

Commands

bash

# Generate screen
/reactnative:generate-screen Profile

# Native module integration
/reactnative:native-module Camera

# Prepare for store
/reactnative:store-prepare

React Navigation setup:

tsx

// RootNavigator.tsx
const Stack = createNativeStackNavigator<RootStackParamList>();

export function RootNavigator() {
  const { user } = useAuth();

  return (
    <Stack.Navigator>
      {user ? (
        <Stack.Screen name="Home" component={HomeScreen} />
      ) : (
        <Stack.Screen name="Login" component={LoginScreen} />
      )}
    </Stack.Navigator>
  );
}

Platform-Specific Code

tsx

// Component.tsx
import { Platform, StyleSheet } from 'react-native';

const styles = StyleSheet.create({
  container: {
    ...Platform.select({
      ios: {
        shadowColor: '#000',
        shadowOffset: { width: 0, height: 2 },
        shadowOpacity: 0.25,
      },
      android: {
        elevation: 4,
      },
    }),
  },
});

LSP Plugins by Stack

Claude Code LSP plugins provide structural code intelligence. Install the recommended plugin for each technology:

Technology	Plugin	Language Server	Installation
Symfony	`php-lsp`	Intelephense	`npm install -g intelephense`
Laravel	`php-lsp`	Intelephense	`npm install -g intelephense`
PHP	`php-lsp`	Intelephense	`npm install -g intelephense`
Python	`pyright-lsp`	Pyright	`pip install pyright`
React	`typescript-lsp`	vtsls	`npm install -g @vtsls/language-server typescript`
Angular	`typescript-lsp`	vtsls	`npm install -g @vtsls/language-server typescript`
Vue.js	`typescript-lsp`	vtsls	`npm install -g @vtsls/language-server typescript`
React Native	`typescript-lsp`	vtsls	`npm install -g @vtsls/language-server typescript`
Flutter	`dart-analyzer`	Dart SDK	Included with Flutter SDK
C# / .NET	`csharp-lsp`	csharp-ls	`dotnet tool install -g csharp-ls`

Install: /plugins install <name>@claude-plugins-official (except Flutter: @claude-code-lsps)

Cross-Technology Patterns

Testing

All technologies follow similar testing patterns:

Technology	Unit	Integration	E2E
Symfony	Pest 4.5+ / PHPUnit 12	Pest 4.5+	Playwright via Pest
Flutter	flutter_test	integration_test	-
Python	pytest	pytest	pytest
React	Vitest 4.1+	Testing Library / Playwright	Playwright
React Native	Jest	Detox	-

Security

Common security practices:

Input validation
Output encoding
Authentication/Authorization
Secure storage
HTTPS enforcement
Dependency auditing

Performance

Common performance practices:

Lazy loading
Caching strategies
Code splitting
Image optimization
Database query optimization
Memory management

Choosing Technologies

Web Application

yaml

modules:
  - path: "frontend"
    tech: react
  - path: "api"
    tech: symfony  # or python

Mobile Application

yaml

modules:
  - path: "."
    tech: flutter  # Cross-platform
  # OR
  - path: "."
    tech: reactnative  # If team knows React

Full-Stack

yaml

modules:
  - path: "web"
    tech: react
  - path: "mobile"
    tech: flutter
  - path: "api"
    tech: symfony
  - path: "workers"
    tech: python

AI-Workforce Orchestration

yaml

modules:
  - path: "."
    tech: paperclip   # When the repo IS a Paperclip fork / custom Paperclip adapter

Paperclip

Paperclip is an open-source orchestration platform for AI workforces: Node.js + TypeScript + React UI + Vitest + PostgreSQL. It acts as a control plane over adapters (Claude Code, Codex, Gemini, HTTP, process) with budgets, approvals, and audit trails. Docs: https://docs.paperclip.ing/ — Repo: https://github.com/paperclipai/paperclip — License: MIT

Architecture

Two-layer:

Control Plane (server + web + DB)   ◄──►   Adapters (claude-local, codex-local, http, process, ...)

Adapters never hold governance state. They execute, heartbeat, report cost, and forward approval requests. Budgets are hard limits; approvals block execution; every mutation emits an activity event.

Key Rules

02-architecture-paperclip.md — Two-layer control plane + adapters, modular monolith, append-only activity log
03-coding-standards.md — TypeScript strict, kebab files, no any, structured logs
06-tooling.md — pnpm 9.15+, tsx, Vitest, Node 20+, paperclipai CLI
07-testing-paperclip.md — Vitest + adapter contract tests + cross-tenant isolation
08-quality-tools.md — ESLint flat config strict-type-checked, complexity limits, coverage thresholds
11-security-paperclip.md — Tenancy, secrets, approval gates, signed adapter channel (ed25519 + TLS 1.3)
12-adapter-protocol.md — Heartbeat, cost reporting, approvals, task envelope, signatures

Commands

See /paperclip:* — 5 audit commands + generate-adapter, generate-agent-config, setup-company.

Use this stack when

You are contributing to a Paperclip codebase (server, web, SDK, or a built-in adapter)
You are building a custom adapter that connects Paperclip to a proprietary execution backend
You are onboarding a company onto Paperclip and want guardrails on agents, budgets, and approvals

Don't use this stack for

Generic Node.js / TypeScript apps — use react + (symfony or python) instead
Replacing a job queue — Paperclip is governance on top of AI execution, not a queue

Internal Tooling Note: Svelte 5

Note: Svelte 5 is not a supported project stack in Claude Craft. However, the built-in Kanban SPA (claude-craft kanban) is itself implemented in Svelte 5. This is an internal implementation detail — Svelte is used for Claude Craft tooling, not as a recommendation for user projects. Community-maintained Svelte references are available at .claude/references/svelte/CLAUDE.md with a full disclaimer.

Technologies Guide ​

Maturity Tiers ​

Tier Overview ​

Tier Requirements ​

All Technologies at a Glance ​

Upgrade Path ​

Overview ​

Symfony ​

Architecture ​

Key Rules ​

Commands ​

Templates ​

Flutter ​

Architecture ​

Key Rules ​

Commands ​

State Management ​

Python ​

Architecture ​

Key Rules ​

Commands ​

Type Hints ​

React ​

Architecture ​

Key Rules ​

Commands ​

Component Pattern ​

Hook Pattern ​

React Native ​

Architecture ​

Key Rules ​

Commands ​

Navigation ​

Platform-Specific Code ​

LSP Plugins by Stack ​

Cross-Technology Patterns ​

Testing ​

Security ​

Performance ​

Choosing Technologies ​

Web Application ​

Mobile Application ​

Full-Stack ​

AI-Workforce Orchestration ​

Paperclip ​

Architecture ​

Key Rules ​

Commands ​

Use this stack when ​

Don't use this stack for ​

Internal Tooling Note: Svelte 5 ​

Technologies Guide

Maturity Tiers

Tier Overview

Tier Requirements

All Technologies at a Glance

Upgrade Path

Overview

Symfony

Architecture

Key Rules

Commands

Templates

Flutter

Architecture

Key Rules

Commands

State Management

Python

Architecture

Key Rules

Commands

Type Hints

React

Architecture

Key Rules

Commands

Component Pattern

Hook Pattern

React Native

Architecture

Key Rules

Commands

Navigation

Platform-Specific Code

LSP Plugins by Stack

Cross-Technology Patterns

Testing

Security

Performance

Choosing Technologies

Web Application

Mobile Application

Full-Stack

AI-Workforce Orchestration

Paperclip

Architecture

Key Rules

Commands

Use this stack when

Don't use this stack for

Internal Tooling Note: Svelte 5